//
//  XNMainTabbar.swift
//  weibo
//
//  Created by 王向宁 on 16/5/19.
//  Copyright © 2016年 王向宁. All rights reserved.
//

import UIKit

class XNMainTabbar: UITabBar {

  //在init方法中添加子视图
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        addSubview(plusBtn)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        
        //获取每一个按钮的高度
        let w = self.bounds.width / 5
        let h = self.bounds.height
        let rect = CGRect(x: 0, y: 0, width: w, height: h)
        
        var index: CGFloat = 0
        for subView in subviews {
            if subView.isKindOfClass(NSClassFromString("UITabBarButton")!) {
                subView.frame = CGRectOffset(rect, w * index, 0)
                
                index += (index == 1 ? 2 : 1)
            }
        }
        
        plusBtn.frame = CGRectOffset(rect, 2 * w, 0)
        
    }
    
    lazy var plusBtn: UIButton = {
        let btn = UIButton()
        
        btn.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: .Normal)
        
        btn.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: .Highlighted)
        
        //设置背景图片
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: .Normal)
        
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: .Highlighted)
        
        return btn
    }()

}
